
import java.util.*;
public class Test {
    public static void main(String[] args){
        Set<String> set = new HashSet<>();
        Scanner scan = new Scanner(System.in);
        while(scan.hasNextLine()){
            String str = scan.nextLine();
            String[] strArray = str.split(" ");
            for(String x : strArray){
                set.add(x);
            }
            System.out.println(set);
        }
    }
    public static void main1(String[] args){
        Scanner scan = new Scanner(System.in);
        while(scan.hasNextInt()){
            int n = scan.nextInt();
            int f1 = 1;
            int f2 = 1;
            int f3 = 0;
            while(n > f3){
                f3 = f1 + f2;
                if(f3 >= n){
                    break;
                }
                f1 = f2;
                f2 = f3;
            }
            if(Math.abs(f3 - n) < Math.abs(f2 - n)){
                System.out.println(f3 - n);
            }else{
                System.out.println(f2 - n);
            }

        }
    }
}
